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A particle falls from infinity to the earth. Its velocity on reaching the earth surface is:
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Important Questions on Work, Energy and Power
MEDIUM
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IMPORTANT
The potential energy of spring when stretched by a distance is The energy of the spring when stretched by is -
EASY
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In a winding (spring) watch, the energy is stored in the form of :
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of work is done in sliding a block up an inclined plane of height The work done against friction is
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A body of mass is under a constant force which causes a displacement in metres in it, given by the relation where, is in seconds. Work done by the force in, is?
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A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring, so that the spring is compressed by a distance d. The net work done in the process is:
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A block of mass is attached to the lower end of a vertical spring. The spring is hung from the ceiling and has a force constant . The mass is released from the rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be
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An engine pumps water continuously through a hose. Water leaves the hose with a velocity and is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?
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A body of mass is thrown upwards with velocity of . It momentarily comes to rest after attaining a height of How much energy is lost due to air friction ?
